It’s my firmly held belief that there is nowhere near enough attention paid to the subject of this kind of growth. There’s a whole lot of “reach for your dreams” and “commit to your goals” and not nearly enough “stretch out and change.”
Specialization is for insects — Robert Heinlein
Too much commitment leads to a one-dimensional human. It may be okay for the person who absolutely must be “the best” at what they do but it sure stifles growth in other areas. People are like computers, we can do lots of different things. And we should.